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What should Dispose do - just clean up the resources or execute some “business logic”?

Given the semantics of IDisposable, what should Dispose do besides clearing resources, of course?

I have seen that many classes use the Dispose method to initiate shutdown processes and some other things, and not just to "clean up resources". For example, if you have a thread inside a class that needs to be disconnected, do you expect the Dispose call to elegantly disconnect that thread ?

IMHO I would apply the Stop / Shutdown method to this object and gracefully disable the thread there, while in Dispose I would check when the thread is still alive, just to call Abort on it (kill style :)).

The same example can be with timers and all other resources that may have some kind of completion process before completing work with this object.

Two examples of conflicting constructs in .NET:

  • ServiceBase for Windows Services has OnStop as well as Dispose to overrides.
  • WebApp.Start from OWIN for self-hosting gives you an IDisposable, which I believe disables maintenance somewhere in the Utilization process.
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